Ekko will need a hotfix next patch, he's really terrible now.
They completely gutted tank ekko by making his ult a flat heal increased by percent missing AP with an AP ratio (aka it's no longer more HP = larger heal), lower passive damage late game (down like 30 or 50), and they removed his passive's slow.
Now assassin Ekko, who is already not that good due to terrible early game nerfs by Riot and unreliable Q, his hurt even more. No longer can he Q E passive run away and still be barely out traded, instead he'll Q E passive run away and lose twice as much health than his opponent. They haven't reverted any of the previous nerfs to his early game, yet Tank Ekko is dead. And what buffs does he get? More Q AP ratio out going, slightly more mana regen, 10 more damage to his passive level 1 (still nerfed by 30 late), and the most useless ultimate buff. Still the same, terrible, early game.
Suggested changes? Unnerf base AD because tank ekko is dead, passive gives a bit more MS early game, Q gets base damage unnerfed (I'll even take a cooldown nerf for it) also AP ratio up more, W shield value base increased a bit and shield per AP increased a large bit, ultimate damage down (ratio), unsure to change heal, lower cooldown. His ult is his escape, not his main nuke. While we're at it, disable him from buying Rylai's because his passive shouldn't slow and that gives it a 40% slow.